Water pump. Again

[theprof]

Head where my feet should be!
The header tank removal proved interesting! The two studs that hold it to the bulk head where not located in the GRP or in anyway located on or in it. They where just through holes with the nuts in the engine bay, and me looking for the other ends. Heance my head where my feet should be. Came up well though. Used a bird feeder cage cleaning brush. Did not even know one existed.
Water pump and t/stat went on Ok. Nice new stainless fastners.
And this is where things went a little strange. I refurbed the swirl pot and inspected and refitted the the hoses which where in good condition. The hose coming from the top of the pot in the picture is blanked off with a bolt in the end of the hose and jubliee clamped. It was cable tied down where the hornes are. I have it loose at the momment.
Any ideas as why this is the case would be welcome.
Also, how do i avoid an air lock when refilling the system?

This is no place to put ones head!

[theprof]

Thanks gentleman, I shall investigate today.

[theprof]

Thanks to the tips from everyone on resolving my air lock problems. Big shout out to 'tvrgit' the bleed screw tip worked a treat. Had to higher the front end a bit (air bubbles will travel to the highest point). Now purring like a kitten, and the new water pump means I can hear the fan kick in. Was a very noisy bearing.